Jack



H. A. THURNDIKE.

JACK.

APPLICATION msu Nov. f1. 1919y RENLWH) FEB. 23,1921.

2 SHEETS SHEET Z,

Patented Oct. 18, 1921.

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Specification of Letters Entente'.

Patented @eto it,

Application tiled November e, loro, Serial ido. 55365513. Renewedrebrnary 23, 1921. serial No. Ef-$7,226.

VTo all w from if may concern:

Be it lrnovrn that l, Herinner A, 'llnionnorne, a citizen oi the UnitedStates, and a resident of iliashington, in the District of Columbia,have invented certain new and useful improvements in Jacks, of which thefollowing is a speeilicetion.

My invention is an improvement in jacks, and has for its object toprovide a device ot the character specified, especially adapted :for usewith motor vehicles, and to be tached permanently in place on the axles,and to be normally ont oi' operative position, but capable of beingbrought into operirtion when desired, merely by the rnoveinent of thejaclr in its normal operation.

ln the drawings:

Figure l is :i side view of e portion o e motor vehicle provided withthe improved isch, the jack being shown in operative posi tion, l

2 isa vertical section in a piene porallel with the erle,

Fig. 3 is a side view of the jock in inop erotive position,

ligs. d and 5 are sections on the lines 4rd, and 5 5 respectively, ofFig. 2.

'ln the embodiment of the invention shown, e. suitable casing isprovided, the said casing)7 comprising a body l, which is substantinllyrectangular in cross section, the top beine; closed by la plete 2, Whilethe bottorn is adapted to be closed by the foot 3 of the jack.

llt vvill be noticed that the casing l is of relatively great length,and relatively narrow width, and a screw d is journaled longitudinallyof the casing at the top. This screw has intermediate its ends anannular groove 5, and a cross pin 6 held in the casing, engages thegroove, to prevent longitudinal movement of the screw.

The ends of the screw are oppositely threaded. es clearly shown in Fig.2, and upon each of the said ends there is mounted a nut 7. Each ofthese nuts has on its'upper side an undercut rib 8, and these ribsengage within a similarly shaped groove 9 in the top of the casing, toguide the nuts and to prevent downward vmovement thereof with respect tothe casing, when the screw is turned.` lt will be obvious that when thescrew is turned the nuts will be moved toward or from each other, in adirection depending upon the direction of motion of the screw.

Esch nut 'l' has a pair of depending,u luge l0 at its outer end, thesaid lugs being spaced apart -lirorn eoch other, and a system, of lazytongs l1 is pivoted to' the logs. rllhe system of lazy tongs is oivotedet its lower end to the tootB before mentioned, and at the center of theseid foot, and'the lazy tongs is composed of levers pivotally connectedto each other the nuts end in snch inenner that when thenuts are movedtogether the systeni as a whole is elongated, While when the nuts arenioved apart the system is shortened. Thos when the nn'ts .are rnovedtogether, the `loot 'ivill be moved away from the screw, ivhile when thenuts nre rnoved apart, the oot vvill he moved toward 'the screw, andwhen the systern is `fully contracted, the floot abutsagainst the lovveredge of the casing and closes the seine.

ln order 'to turn the screw to operate 'the lazy tongs e Worin Wheel l2is secured to extended end oi3 the screw, and this rvorrn Wheel mesheswith a worin 13 on o driving shaft to which the Worin is keyed. llhisdriving shaft lll has one end polygonal as shovvn at l5, lor engagementby a wrench or the like to turn the shaft. The driving mechanism for thescrew namely the vorm Wheel, ivorrn and shaft lll are arrenged in anauxiliary housing 16, which is detachably connected to the casing 1,*topermit its removal to inspect the Worin gearing.

While it is obvious that the improved jaclr may be used, and is suitablefor use, in any connection Where a jack is desired, it is especiallyedapted Afor use with motor vehicles, to form a permanent attachment inconnection with the vehicle. With vthis object in view l arrange a jackat each corner of the vehicle, that is near each end of each axle. lnorder to connect the jack to the axle, l provide in connection with eachcasing a sectional bearing, consisting of e section 16 rigid with thecasing, and s section 17 detachably connected with the section 16, asindicated at 18. The sections 16 and 17 are adapted to embrace the 4rearaxle housing and the front axle, and the bearings are shaped to lithousing or axle as the case may be. lln the present instance the bearfings are shaped to fit the housing. @nce 1n place, the jacks may be soleft, they being of such size that they will be inconspicuous, dependingbut slightly below the axle housing or axle as the case may be` Therelative the foot,

proportion oi axle housing and jaclr is indicated in l41 ig. l. When itis desired to use the gaelr, a suitable tool may be engaged with thepolygonal end l5 ot the shatt 14, to rotate the shaft in a direction toextend the lazy tongs. rlhe toot 3 is moved downward and will engage theground smoothly, re-

y of the intermediate series, which are single,

and a little less than twice the thickness of a member of the firstnamed series.

l claim:

l. A jaclr of the character described comprising a substantiallyrectangular casing open at its bottom and carrying at one side clampingmeans engageable about the axle of a vehicle, an extension formed at oneend of the upper portion of the casing, a shaft journaled through theupper portion of the casing and the extension, said shaft beingoppositely threaded adjacent its ends and being limited to rotarymovement, the underside of the top of the casing being formed insonniwith a guide groove, nut members slidable along said groove and engagedupon the threaded portions of said shaft, a lazy tongs having the endsot its uppermost links connected with said nut members, a toot memberconnected with the lowerrnost links of the lazfzyitongs.Z and means forturning said shaft comprising a worm wheel secured thereon within saidextension, a shaft journaled through said extension at right angles tosaid threaded shaft and having one end formedfor engagement by ahandle,and a worm on said second named shaft meshing with the worm wheel,

2. A jack of the character described comprising a substantiallyrectangular casing open at its bottom and carrying ab one side clampingmeans engageable about the axle of a vehicle, a shaft journaled throughthe upperdportion ot the casing, said shaft being oppositely threadedadjacent its ends and being limited to rotary movement, the underside ofthe top of the casing being Jformed with a guide groove, nut membersslidable along said groove and engagedv upon the threaded portions otsaid shalt, a lazy tongs having the ends of its uppermost linksconnected with said nut members, a foot member connected with thelowermost links 'of the lazy tongs, and means for turning said shaft.

HERBERT A. THRNDlKE.

